JP2013100915A - Solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve durability of a normally opened solenoid valve by preventing a valve seat from being partially worn by a state that the inclination of a coil spring biased in the direction of opening the valve element causes a valve element to be inclined and made to contact with a specific portion of a valve seat thereof.SOLUTION: The solenoid valve includes: the valve element 4a attracted and driven by an excited coil 2a; a valve seat 4b; an inflow channel 5 provided at the upstream side of the valve seat 4b; a valve chamber 6 provided at the downstream side of the valve seat; an outflow channel 7 provided at the downstream side of the valve chamber; a coil spring 8, one end of which is pressed against the valve element 4a to bias the valve element 4a in the direction of opening the valve; and a spring seat 15, against which the other end of the coil spring 8 disposed at the outer circumferential side of the valve element 4a is pressed. In this valve, the spring seat 15 and the valve seat 4b are constituted of different members and the spring seat 15 is made rotatable to the valve seat 4b.

Description

The present invention relates to a normally open type solenoid valve used for control of brake fluid pressure and the like, and more specifically, a solenoid valve having improved durability by suppressing uneven wear of a valve seat that contacts and separates the valve body About.

An electromagnetic valve that performs brake fluid pressure control of a vehicle is described in, for example, Patent Document 1 below. In the electromagnetic valve disclosed in this document, a plunger (movable iron core) attracted by a magnetic force generated when a coil is energized is slidably held in a bottomed cylindrical sleeve (valve cap). The valve body abuts on the plunger, one end of a guide (fixed iron core) for guiding the valve body faces the plunger, and the plunger and the valve body are urged in the valve opening direction by a coil spring. When the coil is not energized by the urging force, the valve body is separated from the valve seat and the valve part constituted by the two members is fully opened. When the coil is energized, the plunger is attracted by the electromagnetic attraction force and The valve body to be pushed is pressed against the valve seat, and the valve portion is completely closed. This is a well-known normally open type on / off control solenoid valve.

In addition, a solenoid valve with the same configuration is a normally-open type difference that controls the amount of current flowing to the coil and linearly controls the pressure difference (differential pressure) between the upstream and downstream fluids with the valve section as the boundary. Pressure control solenoid valves are also known.

JP 2002-347597 A

  The solenoid valve that urges the valve body in the valve opening direction with a coil spring tends to have uneven pressing force when the valve body is pressed against the valve seat using magnetic attraction force. The valve seat may be unevenly worn, and the valve portion may fail to close.

  Therefore, the present invention has an object to prevent the contact of the valve body with respect to a specific portion of the valve seat, thereby improving the reliability of the normally open solenoid valve by uniformizing the wear of each part of the valve seat. It is said.

In order to solve the above problems, in the present invention,
A valve body that is driven by suction by an excited coil, a valve seat that the valve body contacts and separates, an inflow passage that is located on the upstream side of the valve seat, and a downstream side of the valve seat that is provided inside the valve seat A valve chamber in which the valve body and the valve seat are arranged, an outflow passage located on the downstream side of the valve chamber, and an outer peripheral side of the valve body, with one end pressed against the valve body to In a solenoid valve comprising a coil spring that biases in the valve opening direction and a spring seat against which the other end of the coil spring is pressed.
The spring seat and the valve seat are configured as separate members, and the spring seat can be rotated with respect to the valve seat.

  As a preferable configuration of such a solenoid valve, the spring seat can be an annular member surrounding the valve seat and can rotate around the valve seat.

  The spring seat is disposed on the downstream side of the valve seat and the valve chamber and on the upstream side of the outflow passage, and the spring seat is moved by the force of the fluid flowing from the valve chamber toward the outflow passage. It is also preferable to rotate.

  When the spring seat is provided with a passage for communicating the valve chamber and the outflow passage, the spring seat can be rotated by the force of the fluid passing through the passage.

  The electromagnetic valve of the present invention suppresses uneven wear of the valve seat by rotating the spring seat so that the contact point of the valve body with respect to the valve seat is distributed to each part of the valve seat.

  When the coil spring that urges the valve body is compressed and one end of the coil spring tilts with respect to a plane perpendicular to the axial direction, the valve body also tilts. Thereby, the front-end | tip of a valve body is biased to a specific direction (specific phase side), and contact | abuts to a valve seat. The direction of bias of the tip of the valve body at this time is changed by the rotation of the spring seat, so that the position at which the valve body comes into contact with the valve seat changes, and the valve body comes into contact with each part of the valve seat. Thus, uneven wear of the valve seat is suppressed.

  By suppressing the uneven wear, the valve closing failure is prevented and the reliability of the solenoid valve is increased.

Sectional drawing which shows the solenoid valve of this invention in use condition FIG. 1 is an enlarged cross-sectional view of the main part of the solenoid valve of FIG. 1 is a plan view of a spring seat provided in the solenoid valve of FIG. The perspective view of the spring seat provided in the solenoid valve of FIG. A bottom view showing a modification of the spring seat of FIG. The perspective view which shows the spring seat which added the latching | locking part with respect to a coil spring The perspective view which shows the other example of the spring seat which added the latching | locking part with respect to a coil spring. Sectional view of the main part of a solenoid valve of still another reference example The top view of the movable piece provided in the solenoid valve of FIG.

  Hereinafter, an embodiment of an electromagnetic valve according to the present invention will be described with reference to FIGS.

  FIG. 1 to FIG. 3 show an example of a solenoid valve in which a countermeasure against uneven wear of the valve seat is taken. The illustrated electromagnetic valve 1B is in a state of being assembled to the housing 22 of the vehicle brake hydraulic pressure control unit.

  1 to 3 includes an electromagnet 2 that generates a magnetic force by energizing a coil 2a, a valve body 4a that is attracted by the magnetic force and pushed in an axial direction, and the valve body 4a. A valve portion 4 composed of a valve seat 4b to be separated, an inflow passage 5 provided upstream of the valve seat 4b, and a valve chamber provided downstream of the valve seat 4b (the first wall 6a and the first wall facing each other). 2) (space defined between two wall surfaces 6b), an outflow passage 7 that is located downstream of the valve chamber 6 and communicates with the valve chamber 6, and one end that urges the valve body 4a in the valve opening direction. A coil spring 8 pressed against the body 4a, a check valve 9, and a spring seat 15 characterizing the present invention are provided.

  The valve seat 4 b and the inflow passage 5 are formed in a separate seat 10 from the guide 2 c of the electromagnetic valve 2, and the check valve 9 is also incorporated in the seat 10. The seat 10 is press-fitted into the guide 2 c of the electromagnet 2, and the valve chamber 6 is formed between the guide 2 c and the seat 10. The outflow passage 7 is formed in the guide 2 c and communicates the valve chamber 6 and the wheel cylinder 24. 21 is an ECU (electronic control unit) that controls the electromagnetic valve 1B.

  The illustrated electromagnetic valve 1B is assembled to the housing 22 of the vehicle brake hydraulic pressure control unit. In this example, the brake hydraulic pressure supplied from the hydraulic pressure source 23 to the wheel cylinder 24 is controlled. The hydraulic pressure source 23 is generally a combination of a master cylinder and a power-driven pump (both not shown), and a pressure accumulator for storing the hydraulic pressure generated by the power-driven pump is also used as necessary. The

The check valve 9 passes brake fluid that is returned toward the master cylinder when the wheel cylinder 24 is depressurized. The check valve 9 can be provided outside the electromagnetic valve 1B and is not an essential element of the present invention.

The electromagnet 2 includes a coil 2a, a yoke 2b each made of a magnetic material, a cylindrical guide 2c for guiding the valve body 4a, a sleeve 2d covering the coil 2a, and sliding in the sleeve 2d so as to slide the valve body 4a. A plunger 2e that pushes and moves the coil 2a is energized to generate a magnetic force.

  When the solenoid valve 1B is a normally open type on / off control solenoid valve, the coil 2a is supplied with a preset current from the ECU 21, and the valve opening force applied to the valve body 4a (the force of the coil spring 8). A magnetic force that overcomes the fluid force acting on the valve body 4a is generated, the plunger 2e is sucked and driven, the valve body 4a is pressed against the valve seat 4b, and the valve portion 4 is completely closed.

  On the other hand, when the solenoid valve 1B is a differential pressure control solenoid valve, a current controlled to a desired magnitude is supplied from the ECU 21 to the coil 2a. The plunger 2e is attracted and driven by the magnetic force generated by the current, and the valve body 4a is pushed and moved to the balance point of the force acting against the valve body 4a. The pressure difference between the brake fluid 5 and the valve chamber 6 is controlled.

  The above configuration is not different from conventional products. That is, the illustrated electromagnetic valve 1B is provided with a measure for suppressing uneven wear of the valve seat as a feature characterizing the present invention.

  In the electromagnetic valve 1B of FIG. 1, the spring seat 15 and the valve seat 4b are configured by separate members, and the spring seat 15 is supported by the seat 10 so as to be independent of the seat 10 provided with the inflow path 5. doing. One end of the coil spring 8 is pressed against the valve body 4 a, and the other end, that is, the end opposite to the side pressed against the valve body 4 a is pressed against the spring seat 15.

As a method for enabling the spring seat 15 to rotate, here, the valve seat 4b is provided in the seat 10, and the annular recess 16 surrounding the outer periphery of the valve seat 4b is provided on one surface of the seat 10 (the first wall surface 6a shown in FIG. 8). The spring seat 15 is formed of a movable ring (annular member, the material of which may be resin or metal) separate from the seat 10, and the spring seat 15 is integrated with the seat 10 in the annular recess 16. It is incorporated so as to be rotatable relative to the valve seat 4b.

  The spring seat 15 formed of a movable ring has a groove 15 a that forms a passage communicating with the valve chamber 6 on the inner peripheral surface. Further, a small diameter portion 15b and a notch portion 15c (which may be replaced by a hole) are provided on the side opposite to the side facing the valve chamber 6. The groove 15a communicates with the outflow passage 7 via an annular space 17 formed between the outer peripheral surface of the small diameter portion 15b and the inner peripheral surface of the annular recess 16, and the groove 15a, the notch portion 15c, and the annular space 17 are communicated. Becomes a fluid passage and the valve chamber 6 is connected to the outflow passage 7.

When the spring seat 15 is made rotatable in this way, when the spring seat 15 rotates, the coil spring 8 supported by the spring seat 15 and the valve body 4a urged by the spring simultaneously rotate, thereby The contact of the valve body with respect to each part of the valve seat becomes uniform, and uneven wear of the valve seat 4b due to repeated contact of the valve body 4a with the valve seat 4b in a state where the pressing force is unevenly distributed is suppressed.

During operation of the solenoid valve, the spring seat 15 is irregularly changed in the rotation direction and the stop position in the annular recess 16. For this reason, an unavoidable difference arises in the fluid force which the fluid which flows into the outflow path 7 exerts on both side surfaces of each groove 15a. Therefore, as shown in FIGS. 3 and 4, when the groove 15 a is formed in parallel with the axial center of the solenoid valve, the left and right side surfaces when the fluid passes between the valve chamber 6 and the outflow passage 7. Rotational force is generated by the difference in fluid force acting on the spring seat 15 and the spring seat 15 rotates naturally. If necessary, as shown in FIG. 5, the function of actively converting the pressure of the fluid into a rotational force is provided by twisting the notch 15c, and the flow of the fluid is used. The spring seat 15 may be stably rotated in a desired direction.

  As shown in FIGS. 6 and 7, the spring seat 15 formed of a movable ring may be provided with a locking portion 15 d for the coil spring 8. 6 is formed by raising a part of the spring receiving surface of the spring seat 15. As shown in FIG. 7, a part of the pin protrudes from the spring receiving surface. In this way, it can be formed by being implanted in the spring seat 15. If there is this latching | locking part 15d, rotation of the spring seat 15 will be reliably transmitted to the coil spring 8, and the rotational drive of the valve body 4a will be ensured.

Note that uneven wear of the valve seat 4b is prevented by relative rotation of the valve body 4a and the valve seat 4b. Accordingly, the valve seat 4b may be rotated instead of making the spring seat 15 rotatable. As shown in FIG. 8, the valve seat 4b is provided on a movable piece 18 separate from the seat 10, and this movable piece 18 is provided. The same object can be achieved even in a structure in which the sheet 10 is rotatably assembled to the sheet 10.

The movable piece 18 is a disk-shaped piece and is accommodated in a circular recess 19 provided in the sheet 10. The thickness and outer diameter of the movable piece 18 are slightly smaller than the depth and inner diameter of the circular recess 19, respectively. The movable piece 18 is loosely fitted in the circular recess 19. The outer peripheral side of one end of the coil spring 8 is supported by the sheet 10 at the periphery of the opening of the circular recess 19, while the inner peripheral side of one end of the coil spring 8 is the inner diameter of the circular recess 19 without applying a load to the movable piece 18. It is made to enter into the center side of the circular recessed part 19 rather than the surface, and the movable piece 18 can be prevented from escaping from the circular recessed part 19 by the inner peripheral side of one end.

Moreover, the movable piece 18 is provided with a plurality of through holes 18a at appropriate intervals in the circumferential direction, and the valve chamber 6 and the outflow passage 7 communicate with each other through the through holes 18a. Therefore, in a state where the valve body 4a is not seated on the valve seat 4b provided on the movable piece 18, the movable piece 18 rotates by passing through the fluid through-hole 18a.

The through-hole 18a may be either a hole parallel to the axis C of the electromagnetic valve or an obliquely inclined hole having a function of assisting the rotation of the movable piece 18. If the movable piece 18 is rotated by the flow of fluid, the through hole 18a may be a hole parallel to the axis C of the electromagnetic valve.

  The solenoid valve configured as described above is such that when one end of the coil spring is pressed against the valve seat using a magnetic attractive force, the one end side of the coil spring is inclined with respect to a plane perpendicular to the axis of the coil spring 8. There is a tendency that the pressing force applied to the body 4a is unevenly distributed, which causes the valve body to be biased to contact the valve seat. However, the force of the fluid flowing causes the spring seat 15 to rotate relative to the valve seat 4b, so that uneven wear of the seat surface of the valve seat 4b due to use over time is suppressed, and the sealing performance of the valve portion is reduced, thereby The leakage of fluid from the inflow path when the valve is closed to the valve chamber hardly occurs, and the reliability of the solenoid valve is increased.

  The electromagnetic valve 1B of the present invention can be suitably used for a hydraulic device, for example, a brake hydraulic pressure control unit of a hydraulic brake device mounted on an automobile.

1B Electromagnetic valve 2 Electromagnet 2a Coil 2b Yoke 2c Guide 2d Sleeve 2e Plunger 4 Valve portion 4a Valve body 4b Valve seat 5 Inflow path 6 Valve chamber 6a First wall surface 6b Second wall surface 7 Outflow path 8 Coil spring 9 Check valve 10 Seat 15 Spring seat 15a Groove 15b Small diameter portion 15c Notch portion 15d Locking portion 16 Annular recess 17 Annular space 18 Movable piece 18a Through hole 19 Circular recess 21 ECU
22 Housing 23 Fluid pressure source 24 Wheel cylinder C Center axis

Claims (4)

A valve body (4a) driven to be attracted by the excited coil (2a), a valve seat (4b) to which the valve body (4a) comes into contact with and separated from, and an inflow path located upstream of the valve seat (4b) (5), a valve chamber (6) provided on the downstream side of the valve seat (4b) in which the valve body (4a) and the valve seat (4b) are disposed, and the valve chamber (6) Is disposed on the outer peripheral side of the valve body (4a) and one end is pressed against the valve body (4a) to attach the valve body (4a) in the valve opening direction. In a solenoid valve comprising an energizing coil spring (8) and a spring seat (15) against which the other end of the coil spring (8) is pressed.
The solenoid valve characterized in that the spring seat (15) and the valve seat (4b) are constituted by separate members, and the spring seat (15) is rotatable with respect to the valve seat (4b).   The solenoid valve according to claim 1, wherein the spring seat (15) is an annular member surrounding the valve seat (4b) and rotates around the valve seat (4b).   The spring seat (15) is arranged on the downstream side of the valve seat (4b) and the valve chamber (6) and on the upstream side of the outflow passage (7), and the outflow passage from the valve chamber (6). The solenoid valve according to claim 1 or 2, wherein the solenoid valve is rotated by the force of the fluid flowing toward (7).   The spring seat (15) includes a passage (15a) communicating the valve chamber (6) and the outflow passage (7), and is rotated by the force of fluid passing through the passage (15a). The solenoid valve according to claim 3.

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